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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d91674cb9fc754828ae1410509280e7f502859bd38aba22f600403c0f9b75b' 
  AND token = 'glhocWhohwwTEkLg9oPg+ytGpHOTFgW78c2GrA4O7fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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