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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0713d84bd746d4fd463f1a4f35adf84ea7fabb34150c9f7facd7938cfb1e7ef' 
  AND token = 'eRUbdb6Nwv0FVvHBC4/toiJRPzZI3drM11SbzIUVv1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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