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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb9111e90d6d7750998a50a05afcdd9f4b59bcbfdb3fe14ff96bef8a1d87f020' 
  AND token = 'xTl0CWImvcN/wRrGzp45I+tFvqxDXiKjYnxt1etPSgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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