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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8e448f0163336af54d382f17847e8c68f3c647ebea2d350de4d580bbc13b8dd' 
  AND token = '/Fx17cu7NXaEDOx/BtjWJAoFySAnckc1NLeBNnO/XBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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