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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4df0b915b7bb313015252c96819057752d44234d3eec9b445d2848f107320f5' 
  AND token = 'BIp92s55d8KPmtosS0i4N3ErIqCgHEO9uZ4nXZcGofs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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