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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4082a57f4e615f1bb0fc84d0d34430151b7ab2c4c14deb83829c018d81bea01' 
  AND token = '+Mbk37EIoEJ4GN3SWBFG7bR2yoyttgQCqqphj3C/9p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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