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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8183d29de0f2f7c8c969b9555c0b7c4ce086622210adee5b4f0d0febb3fbc341' 
  AND token = 'r7mIoTzifuMfnL3eCVn5tQBDky+jUc/OmeslFFx267c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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