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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c51d6a8e2767f968d2848d8449e04c0f8988bbba0ea502f1f810880dec39379' 
  AND token = 'CJANZVcWObxEvwbNseR0vaO53EA6r6tqvouHf+e3IWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00145

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}