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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b28db18d865a8dbd1571320239ceca9cebe13807f9bc0ac9c4f9f150070b05' 
  AND token = 'ozEj5uFE+XedABtuiFaOc+URCPTA2En+k+6wcJth3gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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