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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d8b06bb2fbeaa847ab12c31745f6eb72d94b35f4bbc8b9e2c76a4b21891128' 
  AND token = 'DHSybdKRPMjXEcZkm02XlbWUTO9KNZ7Y13bkayYg81g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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