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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b8c7f5efa9a6dd0003aa3fda30f9daf9f1028f74100b331a243b77f92c015c9' 
  AND token = 'JgbNoUD8OIjLvSqR/eVhyhkMhGrI1A34M8COTBcZtac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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