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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe852c566b77091248d7438cc3d474632e849faad0d8e9c76cbd2679a84a669' 
  AND token = 'mm3CCQ0yy9zt7eSVDQhDo/5llUBHimnt788yL1Y9ph4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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