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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6f323108181994cc8b17a7d3a3ce796bfd392e528c18db8c7e946c6126e0b6' 
  AND token = 'EzXuUn0wOE+pMzTBz2ezxTewqQqAjusrlN/RhVS++rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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