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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6078a47e829cbc69ef9c50ea79255b1631110ffe752573c4a619d015d0fb8862' 
  AND token = 'hx65cJrTahdHF6nCkeFuUQ2+B1JtmLpxgH8c7laDfjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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