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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0550c59fb4e41151093e0322330a4fcf59a8edd2f59efcb6d2c53a7dd748a393' 
  AND token = 'gD38vQQ7aBTXvFmBtKX/gMAQk+XBKjMhjvctCkR2Qio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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