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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de4636ff9df7e761040c315529fb008c3252aedf81b2b27de39da8b527a2a722' 
  AND token = 'LiJOdksPygTXnQjp8WA8efBp+wf7n1Ie3lKO7ifEmPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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