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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85039bd1c2466f7a779f45d7d7fecf64c3ef213557304a0b093d874fe6dee85e' 
  AND token = 'qDfQHKR/GmTWBcn4K0N6hPSlUfh3w3Ns79yZIvsCOK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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