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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '955282f64c9b1bddae2b9383c6d323b8dd7761d9e668329f00a417845c2661b4' 
  AND token = 'eMQCZjsSDl4sFAIhyG7Z+X60i7fx2ki1B1ufJC04er0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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