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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b414ab963c633c6b987b4c347b7bf61ba3cb4d0634ca747a677638a71218412e' 
  AND token = 'cqsTFr4KtrRAkAI5m2+04iFfYm0/0yvXpev5SfAYItc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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