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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a4d9596a164d6f05dd18123777bc9bcb8a17ecb3eea3f6b5d47c263cccc832' 
  AND token = 'zdSLH9kwCXd8i6QsqB67J75N23eXn2XetSz6lgAdsOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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