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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba72d095c54fbbb53ec86e1831f5357d6568165ffe1d5d8a25ab17f9653d16d' 
  AND token = '1LUX0o1CFls7SjnhNX9SQmeDAN/Z/gw0WWNd9PxHdQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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