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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3e915b6631d35e351f6776f39933b089eafc3a7811fe1185b2d4bf3d4144484' 
  AND token = '1Fm5jChj0FR6lw31chUftfi24LCdS8L7eRw8A176hrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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