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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a670d86359a87a967dbc38fd88c0cce4026c68412c0b691ab4c89da973d71d7' 
  AND token = 'b57g1dFx5qm/DncyqTI9umbjtu/u1g/SxNAyBaV1m6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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