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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ccf0302924176c466e96743dc2cb03dcd7779af060c6e7fe3cd45ee88675dda' 
  AND token = 'lTCNCdYZnx7TRfI9nRnsAgQvbn6gk4dXD8CeqIpmXbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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