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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '877c77e97face34dd2d33ebb76b7e03b204d477dcf6b2bef22517f075fe95698' 
  AND token = 'ltFB0Dg6wr3Pb8org7FSBeNC7xC2yoQTLN1tpVCBMkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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