SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faae219361236b8fd125b97c40c3e91cc94e392a0f0bfa531aa6a9f9dc989dde' 
  AND token = 't7WW2RKlJCPU2Oslv1/bKEUwtyA8/BGWeDzXgzLgljw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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