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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3363a4562a439178bbba2a25b802ed33c0a08947ece12f2ebfefd77987faff0f' 
  AND token = 'NwtKKdJlQhVNVLiRUD6dDQVNPJXmKNVbb+tziU8U00k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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