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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c26dec93c3697a0a03516ac6e875ee7047be12a760696b23e7df55ebbeeca23c' 
  AND token = 'L/NMiCDNvGz7PYWxiRW/yn5p7jaCird29W9gw7PIh/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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