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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6310021e1528df88306b2f04becfe2acaf12cd7ae81fca0012494e5895a3a93' 
  AND token = 'd71sQpcgXDf1346JB/8lxrn3/k1yukiffN0KNB5ok3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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