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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb2bcc2b0fc04b70da62000886cbd4c728b0f9868f35a771e937c0cc42e4c31' 
  AND token = 'elUsYiJ+L0S2W1QcJPPhR7oOhH+WIdnYHvL5XWKvDp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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