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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2522d72b3ff6560aa92112292a6bb29ebb5b6f9fe12d31b3050946d65b9f3c9c' 
  AND token = '4pr9xZkB+lu9jkrlOqjWPA5gz4Fh9SBZOX4YLsO5160=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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