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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1630bdc726cf592ccc554ba31039e06137d423feaa1d1707d3c4fd0e96e8c44b' 
  AND token = 'mN7c4JHiFYogsbCISZxWiScos6YhNSgoC5/nuET+5vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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