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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69113115874e36aabee175ccbd57a18fc8ecb57f73f127cc7f2f3165aa1452db' 
  AND token = 's1Zcay86InWU6AKPqRETV8P6u/Io4kowkl6jRebjjcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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