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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99497b6e8e837a58a8f8242edbfdd7ac34682c5f68bf73e05497ba7e21da994b' 
  AND token = 'tqoUegr7da2vMAdn4yu0VsiMWop8swb16jNpMAWTM54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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