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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8e31ebdbfb6c5d82c0fbb7d2c749d26a0cfc13d315301f5e299ef9a223b234' 
  AND token = 'auBJIrXLft3UewbF+kevVr3ZNjFM+eo2S4dTTtKg26g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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