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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76b9cbf508d261835af3dc0a2e4722ebdab7cf1b7352081499acdc1c9ea8581d' 
  AND token = 'lfR6srWzg3M3ylD5Z98XdxavznUwPpN1zbVRxe7RKkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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