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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26148912687d34ea23bb71c929360c4244a8e2542a85421fb4913a08cd031ddf' 
  AND token = 'jT6jvPeS0NW/ztnV078BX+Hrd4mlf7cDRJKt+KdmdD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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