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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0ce347702919e28893bfdee388f4ae7737bbac0f91c65da2ec4a74d737115b4' 
  AND token = 'MUzlLxkE0V1Z1cUfzR/DPO/iurwQsDiKMp1ZUr9SHd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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