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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34dc5a6796734f4fd3c6c7a7e68f4a505bd384ae2fbd4016f0940470fbbc8ed6' 
  AND token = 'lexDjXnu0NWk6mcGPbmYn06p+d/cyvMO8w/Exq5LLo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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