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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e65ac044e35f03fa669c44b0c5fdaaf2020a17acc9fa2e9ce534355ef01415' 
  AND token = 'r8JB3A+H19h/E24yKItMCvnNQ8ukWaw6SnCmd+4igWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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