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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05fdb4191ac6e4e8af7c60b02aca363d5080f0312a2855b95b8553311bd1010f' 
  AND token = '77cGus8dbjhswnmSRi8tH5EYcilN60k1UsrKLOZo9OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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