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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '604818717eb333c29a04ecaf294a4fbd85f0cf2a45cdd6ffeb7e42bd4c98af0c' 
  AND token = 'KQQpeJ5vlZm7eEj/qDkde/6l4zoy86Ox+ATzXgMeR30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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