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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd4564673be3964f9de4327032c80ae08155886cf698276d2d2198093416df8' 
  AND token = 'RtVt44WRUI4V9lpB+hPJyJrVe0sYx41dcdZj4+b+BWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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