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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db1e013cf625b9687f6ed1e9b63d0e55407065d70d2401279b5b086de1dd2cef' 
  AND token = 'Ss9u46590asPQpg6qjm6NeR9vyXNVD6AQWEVh3PepKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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