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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57df6824cf7d2d47d9f9ec742064412fcd2cfbc800f1674947afd318b6063112' 
  AND token = 'ljnOSn5ZwRNnKU7+H5+hBIomowoMvdFfAEFkA7SsKbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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