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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06de1fe85654167263ee5d34daf4ac3b1a2a3ab1ce8d477c55e1e54fe7ee4fb5' 
  AND token = 'bQ1bSZSmq3fa4qaAtINSZJWcZZSR/tPlpvY0RglvuV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00119

JSON explain

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