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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea6c8270e06d95f5191012bbd3f1aaf94cdf44112446a05e93192724e47ea2f' 
  AND token = 'wiIBjmv9T/ww9JceYr6daY0hSxHn87JMuxC8Q8bySdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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