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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '863923f49dab0674d325eff24392b969181a0c185f9c174d871be88c9fd6be96' 
  AND token = 'fY497FEiXWajiN1zPt9unExQJGhE/gs9C2mGa00eehs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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