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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7aafc1e945eda34ea4483379b4c725a4a73aeb38ee09ace5f9f4f411d8840a' 
  AND token = 'RWN0Oj+RSlVepNRurJfEqtBZnO8kwXPok6YC2eWB7jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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