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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e4f15fe43a95d8c6a93ada473c862b651c63a52fc92081e581be84c2ef4b11' 
  AND token = '0dWBFDxrw/V1tY7FUGUni/szRG/M74ZEkLiW9Y8V4os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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