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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8d2ddb79b5ae6b96fce47b328ca5b2f49ea43d5141041b30a1adac69ff5e809' 
  AND token = '8SvcUsZcNd/I9x6oCtIvz73kpnyOe5QF8YyWOPeoBeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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