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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe34e12f656e60607fcfa5a69e3c51ac7352bce46f81d43bf093733f67ac2cab' 
  AND token = '6KOHv3oc+4qAtQpRmfmQDA//3TmqU8yuagAi00402jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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