SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b45b125a2d3a85786af08af7c42db1132536eeadb3402d8ddc72e2da65c331' 
  AND token = 'rvieX2fhCVQ3hIZYPRGPDDUlgiP0XqcA4+wkmF7+PzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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