SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffb58dfc176b0b8426207c190e7ad62dcc7265405b74c2628dd90fdf336c94ab' 
  AND token = 'q6dz+eQ0+zLoqCE/oUjOhsMUNFEBpn3NjWw45VxJM6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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