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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b85aef109246ea215ce3099439edc80f5437b731c9883c251a6903ee148aa5f7' 
  AND token = '7rEHOr1y5pZ3yh7g5juuQ4ilwVtXe0HmyOS5K1ykOpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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