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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a30c7d36d7003a44ec1ae1d021da03ad3d6225fc74e9f93468bb329726f772b' 
  AND token = 'AlXrmFtG85KyqEVZx80KKazQSWtZgTif4FdA2NhUnlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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