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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0fb5ff9f1ef1eb3b2a671fc2235922bdb0b5d2ea73c6eab21d6cc70aad865a8' 
  AND token = 'JX/UQTVCg+KTXj5CVyGiPdD282n+AXoEsTPZl94awOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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